ModelSamplingLTXV_motorway_edition

ModelSamplingLTXV_motorway_edition is the Motorway-pack version of ComfyUI's ModelSamplingLTXV: it applies LTX-Video's timestep shift to a model, reading the model from the MOTORWAY 🚌💨 bus by key instead of over a wire.

The native node is part of the standard LTX-Video recipe - it's the node named in "LTX-Video: video will not be generated / too noisy" troubleshooting threads. LTX-Video is a latent video transformer trained with a specific noise schedule, and if you sample it with a plain schedule you get garbage or frozen frames. max_shift (default 2.05) and base_shift (default 0.95) set the shift curve; latent (via INPUT_latent_key) is also read from the bus because LTX-Video's shift depends on the latent's shape - the node needs to know the video's dimensions to place the timesteps correctly.

That last bit is the interesting twist for this edition: the native node takes both model and latent as inputs, and the clone reads both off the bus. So this is one of the few _motorway_edition nodes with two INPUT_*_key fields:

• INPUT_model_key (default model) - bus key for the model.
• INPUT_latent_key (default latent) - bus key for the latent.
• OUTPUT_MODEL_key (default MODEL) - bus key the shifted model is written to.

It pulls both off the bus, applies the shift, writes the model back under MODEL, and outputs only the cloned bus. Pull MODEL out with a Motorway 0x1 to feed the sampler.

Installing

cd ComfyUI/custom_nodes
git clone https://github.com/agilly1989/ComfyUI_agilly1989_motorway

or ComfyUI Manager → "ComfyUI_agilly1989_motorway", restart. No pip deps, no model downloads.

The fragility you should know about

Same family-wide caveat: the _motorway_edition clones are auto-generated in clone_nodes_in_the_dangerzone and have historically crashed ComfyUI startup - a 2025 report shows an unrelated RandomModelClipVae class lacking a CATEGORY attribute killing the whole Motorway import. The 1.1.7 hotfix then disabled the clone loader entirely, so on current versions this node may not appear in your menu at all.

And a Motorway-specific gotcha: because the clone pulls the latent off the bus too, your on-ramp has to store latent before this node runs. If you get 'MotorwayClass' object has no attribute 'hash_', that's the missing key. If you're not riding the bus, the native ModelSamplingLTXV is the safer choice.